Screwing-machine.



G. H. WHITEHOUSE & A. COOK.

SCREWING MACHINE.

APPLICATION FILED Aumn. 1911.

1 ,277,801. Patented Sept. :3, 1918.

3 SHEETSSHEET 1.

N fl) Q a v w. o o c 3 .N INVENTORS George M2727 Whi e/20am AMem/ CookQ. ATTGRNEYS G. H. WHITEHOUSE & A. COOK.

SCREWING MACHINE. APPLICATION FILED Aue.11. I917.

1 ,277,80 1 Patented Sept. 3, 1918.

3 $HEETS-SHEET 2- )2 Fig.4

INVE N T006 ATTORNEYS G. H. WHITEHOUSE & A. COOK.

SCREWING MACHINE.

APPLICATION FILED AUG.17. 1917.

Patented'Sept. 3, 1918.

3 SHEETS-SHEET 3- Fig.7

A T TORNE Y6 UNIT TES TO FEE GEORGE HENRY. wHITEHoUsE Ann ALBERT cook;01? wEsrB'RoMwIcH, ENGLAND Assxenons T0 GEo cE HENRY ALEXANDER, O BIE INHAM ENGLAND. j

-- SCBEWING-MACHINE. I

To all whom it may concern:

Be it known that we, GEORGE HENRY WHITEHOUSE, a subject of the King ofGreat Britain and Ireland, residing at Mountjoy, Bratt'street, WestBromwich, in the count of Stafford, England, andALBERT Co0K,'a

.subject of the King ofGreat Britain and Ireland, residing at Gilwern,Phoenix street, West Bromwich, in the county of Stafford,

England, have invented certain new and means ashereinaftervdescribed foradvancplied thereto.

Fig. 3 is a sectlonal end elevation, Fig. 4 a sectional plan and Fig. 5a sectional side elevation showing the slide rest to ,a larger scalethan in the general views at. Figs. 1 and 2. 7

Fig. 6 is a sectional end view of the auto- 7 matic feed mechanism ofthe slide rest, and

Fig. 7 is a view showing separately the inclined tapered push barforming a part of such mechanism.

The same reference letters in the different views indicate the same orsimilar parts.

In the application of the invention, in the manner indicated by thedrawings, to

the construction of a screw cutting lathe or I screwing machine for thecutting of the threads on or in cast iron or other work pieces, the saidwork pieces are carried in any known manner by the rotating spindleforming part of the running headstock as a such as is used for anordinary lathe or like machine. The screw cutting or thread chasing toolI) (Fig. 3) is fixed in a; slide rest 0 carried on the bed dof themachine.

The said restis of the compound or other. type and is provided withscrews or other means for imparting the hand 1 and'2) or otherwise.

Specification of Letters Patent. Patented Sept, 3, 1918. Applicationfiled Au ustin 1911. semurb. 186,727.

movements or adjustmentsof the tool relatively to the work piece, p H

The automatic advance of thetool b for is obtained by means of a facecam ase supported by an extension f 'from the slide rest beneath the topof the bed 05 of the machine, and rotated, by means of a spline shaft gor its equivalent which is driven through change gear wheels 12.,2','y', 70, from the running headstocka aforesaid. During its. rotationthe camrepres'ses against an abutment piece Z adjustably secured to thebed of the machine and by such pressure the complete rest .0 is advanceduntil the chasing tool I) is at the end of the portion of the work pieceto be screwed,at which time the active cam surface. will havepassed overor beyond the abutment piece. A rapid return ,movement of the rest,carrying the tool with it, is effected by a spring or by a weighted cordas m, but immediately prior to such return a quick lateral movement isimparted to the tool 'to withdraw it from the threads it has cut on -theworkpiece. Such lateral movement is imparted preferably by a spring asvn acting ona projection o from the upper portion 0 of the slide restwhich is capable of lateralmovement relatively to the lower or saddleportion; Prior to the next forward stroke of the slide rest the tool isreturned, against the effort of the spring 11,, by the action of theperipheral cam p mounted on the aforesaid spline shaft g.

[By varying or changing the aforesaid change gear wheels h,z', 'j, is,through which the spline shaft 9 isjdriv'en from the headsto'ck a, andby changing the face cam e, screw threads of any deslred pitch may becut on the workpieces.

The adjustment of the abutment piece Z aforesaid may be effected bymeans of a screw g, operate d by a hand Wheel 7" (Figs. The said screwcan serve also as a strut to prevent or assist in preventing a movementof the abutment piece when the machine is in operation.

For imparting feeding movement to the tool I) on each reciprocation ofthe slide rest,

under the combined action of the face cam e to it by the screw spindle3. Such spindle may be rotated by hand, but for the automatic feedmovements of the tool I), a. ratchet wheel 25 is mounted on the spindleand in.

arm of the lever o and slightly rocks the same upon its pivot w. By suchrocking of the lever the pawl a: which it carries engages and imparts aslight rotary movement to the ratchet wheel t, audas such wheel isprevented from endwise movement by the projections y and 2 from thelower or saddle part of the slide rest, the upper portion of the restwith the tool I) is moved sufiiciently to feed the tool toward theworkpiece in readiness for the next cutting or screw chasing strokeunder the action of the face cam 6. During such stroke the rockinglever 1) falls or returns by gravity to efiect the withdrawal of thepawl. Limitation of the extent of the automatic feed movements isprovided for by the adjustable stop piece Z which is clamped to theratchet wheel 25 in such a position as will trip the pawl, after therequired feed movements have been imparted to the wheel. Thus thecontinuance of the reciprocations of the slide rest after the threadshave been cut to the required depth on the work piece, will not resultin any cutting beyond such depth. c

Having thus described our invention what we claim as new and desire tosecure by Letters Patent is 1. In screw thread chasing machinesconsisting in part of a running headstock rotating the work piece and aslide rest carrying the thread chasing tool, the combination with thesaid rest of a rotating cam, an abutment from which the said cam pressesforward the slide rest, means for returning the slide rest toward theabutment, and means for the automatic withdrawal. of the said tool fromcontact with the work piece and its subsequent return thereto, as setforth.

2. In screw thread chasing machines consisting in part of a runningheadstock rotating the work piece and a slide rest carrying the threadchasing tool, the combination with the said rest, of a rotating cam, anabutment from which said cam presses forward the slide rest, means foradjusting the position of the said abutment, means for returning theslide rest toward the abutment, andmeans for the automatic withdrawal ofthe said tool from contact with the work piece and its subsequent returnthereto, as set forth.

3. In screw thread chasing machines, the combination with a runningheadstock rotating thework piece, of a slide rest carrying the threadchasing tool and having relatively movable upper and lower parts, ayielding connection between said parts, means for imparting a movementto the upper part relatively to the lower part in opposition to the saidyielding connection, a rotating cam, an abutment from which the said campresses forward the slide rest, means for returning the slide resttoward the abutment, and means for the automatic withdrawal of the saidtool from contact with the work piece and its subsequent return thereto,as set forth.

4. In screw thread chasing machines, the combination with a runningheadstotk, rotating the work piece, of a slide rest carrying the threadchasing tool and having relatively movable upper and lower parts, ayielding connection between said parts, means for imparting a movementto the upper part relatively to thelower part in opposition to the saidyielding connection, means for imparting automatic feed movements to thesaid tool, a rotating cam, anabutment from which the said cam pressesforward the slide rest, means for returning the slide rest toward theabutment, and means for the automatic withdrawal of the said tool fromcontact with the .work piece and its subsequent return thereto, as setforth.

In testimony whereof we have signed our names to this specification.

GEORGE HENRY WHITEHOUSE. ALBERT 000K.

